INVESTMENTS

3 Months Ended

Mar. 31, 2013

Investments, Debt and Equity Securities [Abstract]

INVESTMENTS

INVESTMENTS

The following table summarizes, by major security type, the Company's short-term investments as of March 31, 2013 (in thousands): 

	Cost		Gross  Unrealized  Gains		Gross  Unrealized Losses			Fair Value
Available for sale securities
Foreign government securities	$	1,945,792	$	41	$	(207	)	$	1,945,626
U.S. government securities	1,624,342		443		(4		)	1,624,781
Total	$	3,570,134	$	484	$	(211	)	$	3,570,407

As of March 31, 2013, foreign government securities included investments in debt securities issued by the governments of Germany, the Netherlands, and the United Kingdom. 

The following table summarizes, by major security type, the Company's short-term investments as of December 31, 2012 (in thousands): 

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale securities
Foreign government securities	$	1,886,822	$	18	$	(287	)	$	1,886,553
U.S. government securities	1,759,773		520		(1		)	1,760,292
Total	$	3,646,595	$	538	$	(288	)	$	3,646,845

There were no realized gains or losses related to investments for the three months ended March 31, 2013 and 2012.